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Customer reply replied 25 days ago

I am trying to replace a Honeywell t5 thermostat with a nest and I seem to have done something wrong with the wiringit's a heat only system w/radiators

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

What are the colors of the wires and which terminals are they attached? If you can upload clear photos that would help.

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Customer reply replied 25 days ago

the problem is that I didn't write down the way it was wired with the Honeywell, so I don't have a clue about how it was wired before. I'm also using a transformer for the c wire

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

That is fine, what are the colors of the wires?

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Customer reply replied 25 days ago

the furnace only has two wires coming from it. one labeled Y and one labeled G

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

Traditionally those wires would connect to the Y and G terminals of the Nest. The Y is the compressor for the air conditioner, and the G is the fan.

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Customer reply replied 25 days ago

the wire colors aren't really meaningful since they don't match what come out of the furnaceIt's a heat only furnacethat's why the y and g didn't make any sense to me

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

If it is heat only then the 2 terminals would be R for 24v power and W for heat.

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Customer reply replied 25 days ago

The transformer wires are going to the R and C terminals on the nest....that seems to be correct because the nest gets power.The problem, as it is wired now, is that the heating doesn't come on when it should

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

Is it possible the wires are reversed? 2 wire system is very straight forward. R and W and configure for the type system you have.

If possible please upload a clear photo so I can see what you have.

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Customer reply replied 25 days ago

where should the two transformer wires go?

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

One is 24v power and the other is 24v common. R and C

Have you tried a jumper wire between Y and W?

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Customer reply replied 25 days ago

No. I didn't have any jumpers on the Honeywell one

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

Please upload a clear photo so I can see what you have.

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Customer reply replied 25 days ago

Of the nest wiring?

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

From the photos it appears there are multiple wires connected to R and C. The Y and G wires and the R and C. There should only be 1 set of wires for R and C not 2 sets.

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Customer reply replied 25 days ago

There is only one with in each.

Home Improvement Expert: David Bowden, General Contractor replied 25 days ago

But it looks like the Y and G are connected to 24v and 24v Common, correct?

I also see on the Nest the wires are as follows:

Red is Y1

Blue is R

White is W1

Green is C

The Nest should be wired as follows;

R terminal gets 24v power

C terminal gets 24v Common

W1 terminal get Heat

The Y terminal is for the cooling compressor which you do not have

The G terminal is for the fan which you do not have

Basically you should only have 3 wires connected.

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Home Improvement Expert: David Bowden, General Contractor replied 24 days ago

Greetings... I was reviewing my open questions and noticed this one has not received a reply. Please let me know if you still require assistance and we can continue.

Thanks,

Dave

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Home Improvement Expert: David Bowden, General Contractor replied 22 days ago

Hello... Just following up to see if you still need help with this question or if I should proceed in closing it out? Please reply and let me know.

Thanks

Dave

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Customer reply replied 22 days ago

I'm all set. Thank you for your assistance.

Home Improvement Expert: David Bowden, General Contractor replied 22 days ago

You are most welcome and please note that I am not an employee of Just Answer, I’m a compensated independent expert, and a user of this site, just like you. Since this question has been answered, please take a moment and select the 5 Stars before leaving today so I may receive full credit for assisting you, and as always you can come back to this question anytime even after it has been rated. Also, you may have seen other experts insisting on tips, for me they are always earned and appreciated, never expected.

David Bowden and 87 other Home Improvement Specialists are ready to help you

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Home Improvement Expert: David Bowden, General Contractor replied 22 days ago

Thank you very much for the positive rating, I sincerely ***** ***** If you need assistance with a different question, just let me know by starting the question “For Dave Bowden”, that way other experts will leave it alone.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.